Author
Topic: Exhaust heat valve question. (Read 3280 times)

Is the heat valve the same for all 69 small blocks with 2" and 2 1/4" headpipes or are there two different valves? What about flanges? I don't have them and need them. Found both a valve and 2 flanges but need to make sure they will fit the factory manifolds and exhaust for a 69 DZ engine.

This is the only one I know of for 1969 small blocks...though most of the ones I have seen were removed and an eliminator ring substituted or they just gutted and reinstalled the factory item by removing the flapper door and weights and a stove bolt inserted to close former axle pivot hole.

Yeah the bottom picture looks right side up as the weight should be installed on the fender side, weight pointed toward the front of the vehicle. Take the top one and flip it around and see what it looks like. Both Look in good condition considering age.

Yeah the bottom picture looks right side up as the weight should be installed on the fender side, weight pointed toward the front of the vehicle. Take the top one and flip it around and see what it looks like. Both Look in good condition considering age.

Those 2 pics are of the same valve. Works perfect, just need to clean it up a bit. So as it sits in the second pic just rotate the valve 1/4 turn clockwise so the weight is parallel with the fender.

These things are problematic at best - I have not hada good experience with any current offerings. For what it'sworth, my two, cents is that they will eventually stick, and probably in the closed or partially closed position.

I removed them from both my '66 Chevelke and '69 Camaroand replaced them with the donut replacements.

Unless you absolutely have to have it original, to methe problems far outweigh the benefits. Both of mycars start easily - and I give them a few extra seconds (10-15) atidle when I first start them, but other than that you would notknow the heat riser valves weren't installed unless you physicallywent and looked.

If you look at the pic of Ricks and mine the weigh mechanism is reversed or backwards or something. One of them is wrong it believe.

No its the same valve - as JohnZ states there IS a top side and a bottom side of the valve. And yes it was common practice to remove or to gut the valve, and close the hole from the removed flapper axle with a standard nut and bolt. That was what was done on my vehicle by the original owner when he removed the smog pump.

Maybe your not seeing what I see. On the Ricks valve pic, the bevel for the packing donut is facing up with the weight mechanism pointing, lets say north and on the right. If you look at my second pic the flat gasket side is up with the weight mechanism pointing north and to the right. If I flip mine over 180 then the weight mechanism is on the left of the valve whereas the Ricks pic is on the right...OR...if you spin my first pic 180 either way, clockwise or counter-clockwise to match the Ricks pic the weight mechanism's are opposite.

No I understand what you are saying but there are many repro valves out there some are flat and chamfered as original, others are chamfered on both sides. ANd they pictures are generic-interchangeable on catalog listings.

No I understand what you are saying but there are many repro valves out there some are flat and chamfered as original, others are chamfered on both sides. ANd they pictures are generic-interchangeable on catalog listings.

OK, I think I got it now. That pic in itself is not a good representation of what an OEM heat valve would look like for a 69 Camaro Z28.

If that's the case does mine look correct? I think the guy said it was a take off of a 71 350 270hp Corvette.